Sandbox

SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cff3b2577c5fa0a7ae5842e6bc3e03500b8cf56561feff377abc6ff17c69d8f3' 
  AND token = 'GnHPF5ecVPWjpGMfK825wU1Bs8dy+95uL8BHc0ih64c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}